We should add to these threads that charge.sh (follow the link in Estel's sig) should be able to act as a software workaround to the problem - not yet personally tested by me, but if it can charge when in USB hostmode, then it can similarly bypass the specifications for a dumb charger.

So if anyone desperately wants to use an external USB charger without having a pure charge cable or a soldering iron at hand... there's your answer.